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DC resistance: 236 ± 24 ohms
AC impedance: 400 ± 80 ohms at 1.0 KHz
Isolation: 10 Megohms minimum (terminals to case)
Polarity: Positive voltage results in positive pressure
Sensitivity: 104 ± 4 dBSPL at 1.0 KHz
Distortion: 10% max over 50 Hz to 6.5 kHz
Standard test setup: A voltage source of 0.707 Vrms connected to the receiver coil through a 240 ohm resistor, the sound outlet coupled through a 10 mm x f1 mm tube terminated in an acoustical volume of 2 cm3.
Figure 1. Typical response and specification range for Songbird receiver. |
这个灵敏度曲线是用什么仪器测试的?能告诉吗?